Experimental Study on the Effect of Water on the Properties of Cast In Situ Foamed Concrete

Zhao, Wenhui; Su, Qian; Wang, Wubin; Niu, Lele; Liu, Ting

doi:10.1155/2018/7130465

Cited by 14 publications

(5 citation statements)

References 21 publications

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“…Compared with projects 2, 3, and the indoor model tests, the results of project 4 show that reasonable cooling measures and the addition of fly ash decrease the maximum temperature increments and increase the corresponding casting times. When it rains, the foamed concrete structure is affected because the permeability coefficient of the foamed concrete is large and water can penetrate into the foamed concrete [25]. However, the upper layer is more affected than the internal portion.…”

Section: Results Of Field Testsmentioning

confidence: 99%

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

Zhao

Han

et al. 2020

Advances in Materials Science and Engineering

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is study aims to investigate the relationship between the heat of hydration and the strength development of cast-in-situ foamed concrete. First, indoor model tests are conducted to determine the effects of the casting density and the fly ash content on the hydration heat of foamed concrete in semiadiabatic conditions. Second, compression tests are carried out to evaluate the development of the compressive strength with the curing time under standard curing conditions and temperature matched curing conditions. ird, the hydration heat development of the foamed concrete is tested in four projects. e results showed that the peak temperature, the maximum temperature change rate, and the maximum temperature difference increased with the increase in the casting density at different positions in the foamed concrete. For the same casting density of the foamed concrete, the peak temperature, the maximum temperature change rate, and the maximum temperature difference decreased with the increase in the fly ash content. For the foamed concrete without the admixture, the early strength was significantly higher under temperature matched curing conditions than under standard curing conditions, but the temperature matched curing conditions had a clear inhibitory effect on the strength of the foamed concrete. e strengths during the early stage and the later stage were both improved under temperature matched curing conditions after adding the fly ash, and the greater the fly ash content, the larger the effect. e maximum temperature increments were higher in the indoor model test than in the field tests for the same casting density. Reasonable cooling measures and the addition of fly ash decreased the maximum temperature increments and increased the corresponding casting times.

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Section: Results Of Field Testsmentioning

confidence: 99%

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

Zhao

Han

et al. 2020

Advances in Materials Science and Engineering

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“…Figure 4 shows the variation of drying shrinkage of concrete specimens with age under different mixing ratios. As the age increases, the shrinkage evolution process of concrete under different MB values can be divided into three stages: rapid shrinkage, slow shrinkage, and shrinkage balance (Zhao et al, 2018). ① In the rapid shrinkage stage (age ≤ 28 d), the drying shrinkage rate of this stage is relatively large, and the shrinkage amount can account for 75% of the total shrinkage, or even higher.…”

Section: Contractilitymentioning

confidence: 99%

Study on performance and fractal characteristics of high-strength manufactured sand concrete with different MB values

Zhou

Ge²,

Chen³

et al. 2023

Front. Earth Sci.

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The mud powder in the manufactured sand will have an influence on the indicators of the manufactured sand concrete (MSC), and the methylene blue value can quantitatively indicate the mud powder content. To demonstrate the impact of MB values on the performance and microstructural characteristics of the manufactured sand concrete, the paper designed five high-strength MSC proportions at five MB values by controlling the clay powder content. On this basis, the workability, chloride migration coefficient, relative dynamic modulus of elasticity (P), mass loss rate (η), and dry shrinkage rate of MSC concrete were tested under five mix ratios, and the relationship between concrete microstructure, fractal characteristics, and compressive strength (fcc) was analyzed by combining SEM technology and fractal theory. The experiment showed that: the higher the MB, the lower the fluidity of the MSC, and the cohesiveness gradually increases, while the water retention remains basically unchanged. In addition, the chloride migration coefficient gradually increases, the P after 300 freeze-thaw cycles first increases and then gradually decreases, while the η and drying shrinkage first decreases and then gradually increases, and the MB value corresponding to the turning point of these three changes are all 1.10. With MB values of 0.85 and 1.10, the degree of hydration of MSC is higher and the overall structural compactness is better. The higher the MB value, the more inadequate the hydration of concrete, and the mineral components such as fly ash that have not been hydrated inside gradually increase, which leads to the gradual decrease of the overall structure compactness. In addition, when the MB value is small, the SEM image texture of concrete is relatively simple, the fractal dimension value is small, and the corresponding fcc is large. When the MB value is large, the texture of the SEM image is complex, the fractal dimension is large, and the corresponding fcc is small.

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“…There are also studies on the use of waste materials to produce new foam concrete [21,22]. It is a lightweight material with a density of 300-1800 kg/m 3 [23,24]. The main property of foam concrete is its low heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Fresh, Mechanical, and Thermal Properties of Cement Composites Containing Recycled Foam Concrete as Partial Replacement of Cement and Fine Aggregate

Pizoń

2023

Materials

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The research presented in this article was conducted to evaluate the suitability of recycled foam concrete (RFC) as an ingredient in newly created cement mortars. The basis for an analysis was the assumption that the waste is collected selectively after separation from other waste generated during demolition. The motivation for the research and its main problem is a comparison of the performance of RFC used in various forms. RFC was used in two forms: (1) recycled foam concrete dust (RFCD) as a 25 and 50% replacement of cement, and (2) recycled foam concrete fine aggregate (RFCA) as a 10, 20, and 30% replacement of sand. The basic properties of fresh and hardened mortars were determined: consistency, density, initial setting time, absorbability, compressive strength, thermal conductivity coefficient, and heat capacity. Research is complemented with SEM observations. The properties of fresh mortars and mechanical parameters were decreased with the usage of any dosage of RFC in any form, but the thermal properties were improved. The required superplasticizer amount for proper consistency was raised four times for replacing cement with 50% of RFCD than for 25% of such replacement. The mix density dropped by about 8% and 9% for mortars with the replacement of 50% cement by RFCD and 30% sand by RFCA in comparison to reference mortar. A 30% decrease in initial setting time was observed for cement replacement. In the case of sand replacement, it was the opposite—an increase of 100%. The dry density decreased by about 14% and 11% for mortars with the replacement of 50% cement by RFCD and 30% sand by RFCA in comparison to reference mortar. Absorbability was raised by about two times after replacement with both RFCD and RFCA. Compressive strength after 28 days dropped significantly by 75% and 60%, and the thermal conductivity coefficient decreased by 20% and 50% with 50% RFCD added instead of cement and 30% RFCA replacing sand. It indicates greater efficiency in thermomechanical means from RFCA in comparison to RFCD. This material can be used especially in the production of plaster and masonry mortar. Linear correlations of dry density and thermal conductivity coefficient and the latter and compressive strength were proven as reliable for RFCD replacement of cement and RFCA replacement of sand in mortars with greater w/c ratio.

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Experimental Study on the Effect of Water on the Properties of Cast In Situ Foamed Concrete

Cited by 14 publications

References 21 publications

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

Study on the Heat of Hydration and Strength Development of Cast‐In‐Situ Foamed Concrete

Study on performance and fractal characteristics of high-strength manufactured sand concrete with different MB values

Fresh, Mechanical, and Thermal Properties of Cement Composites Containing Recycled Foam Concrete as Partial Replacement of Cement and Fine Aggregate

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